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BLOWVIEW
Extrusion Blow Mounding & Optimization
Injection Stretch Blow Mounding
Simulation Software
Montreal, Quebec, Canada
Webinar
2013-06-20
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RheoWare Simulation Inc. is a spin-off of NRC for commercialization of Blowview &
FormView in Europe and Asia
BV/FV is process simulation and modelling tools technology, developed by the Industrial
Material Institute (IMI) of National Research Council of Canada (NRC): Over $40M invested in software development since 1990
A consortium of more than 20 industry leaders involved in the software development
RheoWare at a glance
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National Research
Council Canada
Institutes
• As Canada’s principal public R&D organization carrying out
scientific and technical work, the NRC will play a leading role in
developing an innovative and knowledge-based economy
• 20 research institutes
• 4,000 + employees 1,200 guest researchers
• $800 million budget $100 million income
• As Canada’s principal public R&D organization carrying out
scientific and technical work, the NRC will play a leading role in
developing an innovative and knowledge-based economy
• 20 research institutes
• 4,000 + employees 1,200 guest researchers
• $800 million budget $100 million income
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24,000 sq. ft. of office
and lab space
22 companies in
incubation
NRC-IMI
Incubation of
Technology-Intensive
Firms
NRC-IMI
Incubation of
Technology-Intensive
Firms
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6 Key Sectors
Packaging
Medical
Plastic Industry
Automotive Construction
Sectors where
BlowView and FormView
can make a significant contribution
Transport
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Industrial Users Industrial Users
Industry-pull to simulate
new process for minimal
emission fuel tanks
Sustained and pervasive industrial
support (1992-Present)
Majority of plastic fuel tanks in the
world designed with NRC
simulation
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BlowView and FormView are finite element analysis tool capable of predicting
parison / preform / sheet deformation in extrusion blow molding, stretch blow
molding and thermoforming applications.
Software is useful for engineers, technicians, mold makers and resins
manufacturers etc.
BlowView & FormView
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Competitive Advantage
Finite element solver specifically for plastic industry
Precise, fast, 10x faster than other commercial software
Solves day-to-day problems in industrial manufacturing
Digital moulding and optimization through the consideration of material
characterization
Developed by an innovative and advanced R&D institute (IMI) for more
than 20 years
Used and validated by more than 50 industry leaders in Europe, North
American and Asia
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Simulation in Product Development
Product Specifications
Production
Pre-Production Validation
Optimization on tooling and operating conditions:
• production cost • part quality
Simulations to determine initial Design:
• mould • part • material
Corrections
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Extrusion Blow Moulding (EBM)
Simulation
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Process simulation:
Flow in extrusion dies
Parison sag
Mould clamping
Parison inflation
Part cooling
Part shrinkage and warpage
Additional options:
Coupled effect of sag and swell in parison extrusion
Effect of die geometry (Possibility of simulating different types of die)
Monolayer, multilayer and 3D blow moulding
Extrusions at non-uniform gap
Design advisor for multi-objective part development
Non-isothermal effects
Prediction of forming defects (webs and folds)
EBM Process Simulation
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EBM Parts Simulation
Old and new Booster Seat comparison:
• 25% Weight Reduction
• 10% Cycle Reduction
• Quality Improvement
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Parison Extrusion and Stretching
Mould Displacement
Parison Blowing
Final Part
Thickness
JERRY CAN
EBM Process Simulation Integrated phases
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Parison Mould Displacement
Parison Blowing
Final Part Thickness
Air Duct
EBM Process Simulation Integrated phases
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Extrusion Blow Moulding
Simulation Case Study Modeling and Optimization of Blow Moulded Parts
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1. Parison Extrusion
2. Parison Stretching
3. Mould Traveling & Clamping
4. Part Inflation
6. Part
Warpage
5. Part Cooling
BlowView Software
EBM Process Simulation Integrated phases
BlowView Software
EBM Process Simulation Integrated phases
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Fuel Tank
HDPE – 4261
lu = 6 s
h0 = 330 kPa.s
Flow rate = 270 g/s
WE No. = 1 – 30
Length = 1700 mm
Material
Properties
Operating
Conditions Case Study Part
Simulation
22
0
0
0
ii
ii
Su
G
GJ
l
lhhl
h0 = Zero-shear viscosity hA diedie
QWE
l
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Part Thickness
(Experimental vs. Simulation)
Part Thickness
(Experimental vs. Simulation)
The exact physical process
parameters were used for the
virtual simulation to predict the
distribution.
1
2 3
4
7
5
8 6 9
12 10 11
13
14
16
15
17
18 19 20
24
21
22
23
25 26 27
28 29
30
31 32 34 33
35 36 37 38
39 39 38 37 36
35
31 32 34 33
28 29
24
23
25 26 27 30
21
1
2 3
4
7
5
8 6 9
12 10 11
13
14
16
15
17
18
19 20
22
Comparison between physical and virtual EBM shows good
agreement.
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Error Estimation
(Experimental vs. Simulation)
Error Estimation
(Experimental vs. Simulation)
Variable Physical
Prototype
Simulation
Prototype
% Error
Flow Rate (Kg/hr) 888.6 872.5 1.8
Cycle Time (s) 57.1 56.1 1.7
Shot Weight (kg) 13.81 13.91 0.7
Part Weight (Kg) 9.995 9.91 0.8
Flash Weight (kg) 3.82 4.00 4.7
Minimum Thickness (mm) 3.04 3.06 0.6
Physical and virtual EBM comparison shows over 95% accuracy.
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Machine Stroke
(Experimental vs. Simulation)
Machine Stroke
(Experimental vs. Simulation)
• Program points from simulations can now be readily
used as a starting point for machine profile settings.
Elimination of trial-and-error approach resulted in lower labor & faster delivery.
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Objective Targeted: Uniform part thickness = 3.0 mm
Design Variables: Gap opening,
Maximum die gap,
flow rate,
stroke motions
Parison length: 430 mm
Extrusion time: 30 sec
No of prog. points: 10
Initial gap opening 60%
Uniform Part Thickness
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2.5 mm
9.4 mm
2.6 mm
9.7 mm
2.4 mm
12.3 mm
2.8 mm
12.0 mm
0.5 5.0 mm Target value 3.0 mm
6.8 mm
s
T
VWDS
0.63
3.02
VWDS+PWDS
0.51
3.03
VWDS+SFDR
0.45
3.06
VWDS+SFDR+PWDS
0.4
3.1
Initial Design
0.83
3.38
Optimization Results
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Part Case Study Optimization
Strategy Material
VWDS Generic HDPE Minimum Part
Thickness
Minimum Part Thickness
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Objective Targeted: Minimum part thickness = 3.4 mm
(before shrinkage)
Design Variables: Gap opening,
flow rate
Parison length: 1405 mm
Extrusion time: 120 sec
No of prog. points: 64
Initial gap opening 50%
Courtesy of Vitec
Minimum Part Thickness
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0
10
20
30
40
50
60
70
0 20 40 60 80 100 120
Extrusion Time [s]
Die
Gap
Op
en
ing
[%
]
Initial Design
Iter. #1
Iter. #5
Iter. #10
Iter #15
Final Design
Optimization Results
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Initial
Design Iter #2 Iter #5 Iter #10 Iter #15 Iter #20 Iter #30
Tmin
3.52
21.99 mm
3.4
15.0 mm
3.4
15.0 mm
Optimization Results
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Part Case Study Optimization
Strategy Material
VWDS Generic HDPE Minimum Part
Weight
Minimum Part Weight
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Courtesy of Kautex
Objective Targeted: Minimum part weight
(Minimum part thickness = 3.0 mm)
Design Variables: Gap opening,
flow rate
Parison length: 1550 mm
Extrusion time: 56.1 sec
No of prog. points: 64
Initial gap opening Slide 21
Minimum Part Weight
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13.1 kg 11.5 kg 10.2 kg Initial design Iteration #1 Iteration #2
Optimization Results
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Thermoforming (THMFG)
Simulation
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Forming Processes
Thermoforming
- Transportation, electronics, construction, packaging
- Car doors and windows, electronic housings, baths, signs, trays and
containers
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Thermoformed Parts
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Software Capability
Thermoforming Simulation
• Process:
– Sheet reheat by radiation
– Sheet stretching and forming
– Part cooling
– Part shrinkage and warpage
• Additional options:
– Local mesh refinement
– Vicoelastic and hyperelastic models for large deformations
– Non-isothermal effects
– Prediction of forming defects (webs and folds)
– Plug effect including slip
– Monolayer, multilayer, twin sheet and 3D thermoforming
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Thermoforming Case
Boat Base
Boat base
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Boat base-validation
Thickness measured with magnetic gage
Thickness predicted by FormView
The simulation predicts accurately the real process.
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Thermoforming Food Container
Part Thickness Distribution
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 20 40 60 80 100 120 140
Position (mm)
Th
ick
nes
s (m
m)
experimental measurements
predictions with slip
predictions without slip
predictions without frictionBottom
Lip
Center
The software has a slip function.
Simulation with slip provides more accurate results.
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1-2. Sheet Heating and Transfer
3. Mould & Plug Displacement
3. Vacuum Forming
Plug-Assisted Thermoforming Simulation
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Thermoforming Plug-Assisted
Case: Toolbox
Part Thickness
0
0.5
1
1.5
2
2.5
3
3.5
4
0 200 400 600 800 1000Position (mm)
Thic
kness
(m
m)
Measurements
Prediction - no slip
Prediction - friction coeff=5.0
Prediction - friction coeff=2.0
Prediction - friction coeff=1.0
Prediction - friction coeff=0.17
Initial sheet thickness
B A A B
A
B
Different coefficient of slip will provide different results.
Slip is important in simulation.
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How To Run Simulation
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BlowView
2. Die / Parison /
Preform Geometry
1. CAD Mould Files
3.Machine Processing
Conditions
4. Material Properties
from Database
Conversion (if necessary)
BlowView
Deformation
Results
Temperature
Results
Results for
Structural
Analysis
Simulation Process Simulation Process
Pre-simulation Post-simulation
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Mould Design
Mould & part design by one of following CAD Systems:
Unigraphics
Catia
ProEngineer
Ideas
Amira
Ansys
AutoCAD
Solidedge
SolidWorks
Cimatron
Other domestic software
o Requirement
o Design a preliminary mould containing just the cavity
o All other equipments (pinch plates, rod) must also be drawn in CAD
o Moulds must not have any holes
Moulds and parts
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CAD Files Conversion
Amira (.am), Ansys (.ans, cdv), AutoCAD (.dfx),
Unigraphics (.inp), Catia (.stl), Proengineer (.stl), Ideas
(.unv)
Output files of all parts and moulds from CAD System
Import these files in BlowView
Convert these files into .pat (Patran) format in BlowView
Meshing must be in triangular element format
*.stl
*.inp *.am
*.ans
*.cdb
*.dfx
*.unv
Files Conversion to
*.pat (Patran)
BlowView format
Mesh of Mould
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Demo
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Benefits from Simulation
Conception and fabrication of a mould & part adapted to the client’s need and to the market. The manufactures will have to produce more and more complex parts with specific characteristics. The simulation will allow customers to quickly make those parts.
Guide in the design of moulds by identifying troubled area and minimize design problem before production. Help diagnostic various manufacturing defects (warping, webs and folds). These problems can be avoided right away in the simulation stage.
Guide the choice of equipment to produce new parts. A part can be simulated with different types of die in order to find the optimal way to produce it.
Reduction in the product development cycle. By using process simulation, the customer can proceed to modifications and improvements at the design time and develop a better part faster by identifying problems earlier on. It can avoid costly trial and error in the mould fabrication stage.
Help in diagnostic various manufacturing defects (warping, webs and folds) to improve the part quality. These problems can be avoided right away in the simulation stage.
Eliminate trial and error method by simulating those different possibility virtually , reduce the development costs. By reducing the number of trials and error, thus reducing the number of prototype, the customer can reduce its cost of mold rework, material and labor.
Production processes optimization. The optimization module allows the customer to optimize the existing process to find the optimal processing conditions of the machine for the desired parts.